/******************************************************************************
 * FILE: omp_reduction.c
 * DESCRIPTION:
 *   OpenMP Example - Combined Parallel Loop Reduction - C/C++ Version
 *   This example demonstrates a sum reduction within a combined parallel loop
 *   construct.  Notice that default data element scoping is assumed - there
 *   are no clauses specifying shared or private variables.  OpenMP will 
 *   automatically make loop index variables private within team threads, and
 *   global variables shared.
 * AUTHOR: Blaise Barney  5/99
 * LAST REVISED: 04/06/05
 ******************************************************************************/
#include <omp.h>
#include <stdio.h>
#include <stdlib.h>

int main (int argc, char *argv[]) {

    int   i, n;
    float a[100], b[100], sum; 

    /* Some initializations */
    n = 100;
    for (i=0; i < n; i++)
        a[i] = b[i] = i * 1.0;
    sum = 0.0;

#pragma omp parallel for reduction(+:sum)
    for (i=0; i < n; i++)
        sum = sum + (a[i] * b[i]);

    printf("   Sum = %f\n",sum);

}
